How the Colombian army sent a hidden message to hostages… using a pop song

Colonel Jose Espejo was a man with a problem. As the Colombian army’s communications expert watched the grainy video again, he saw kidnapped soldiers chained up inside barbed-wire pens in a hostage camp deep in the jungle, guarded by armed FARC guerillas. Some had been hostages for more than 10 years, and many suffered from a grim, flesh-eating disease caused by insect bites.